I still have bad memories of driving down a quiet, country lane in rural France, the type with banks on either side, with my wife and children. It was very dark and warm. Absolutely out of nowhere my windscreen was an explosion of water and I could see nothing. Luckily I stopped OK, and found it was an industrial scale watering hose rotating occasionally across the road. Scared me half to death.

This test lacks realism.

Water of this scale does not typically fall out of a bright sunny sky. It is almost always associated with greatly decreased visibility --- sometimes even at night.

In the middle of such a downpour, most people aren't standing still like a dummy with their head, face and silhouette fully exposed to oncoming traffic.

Would the performance be better or worse in a more realistic scenario? I see no reason to expect anything but the latter. How much worse remains to be answered.

What this does show pretty clearly is the typical response when "triggered" --- slam on the brakes. There are reports of trash blowing across the road being a "trigger". Avoid following a Tesla if possible.

That looks like a water hose test.